THE TRUNK. 451 



ram. descend, pubis). 7. Between fascia perinsei and pelvis lie 

 from before to behind : 



a. Pars membranacea urethra with Cowper's glands and in- 

 vested behind by mm. bulbo-cavernosus. 



b. Prostata, pars prostat. urethra and collum vesica, attached 

 above by lig. pubo-prostaticum (six to eight lines behind the sym- 

 physis pubis, two or three above the anus). 



c. Vesicula seminales, and vasa deferentia between them, and 

 crossing with the inferior extremity of the ureters. In the tri- 

 angular space between them the fundus vesicce rests upon the rec- 

 tum ; between the last the neck of the bladder, prostatic and mem- 

 branous portion of the urethras, a triangular space also exists 

 (which is taken advantage of in Lithotomy). 



8. Anterior portion of fasc. pelvis (forms a sheath for the pro- 

 stata and plex. venosus prostaticus). 9. Laminated areolar tissue. 

 10. Peritoneum. 



b. In the female the proper perineum, that is, the region between 

 the labia. majora and orific. ani. is shorter (fifteen lines long), but 

 broader than in the male. Fascia perincei, very strong ; the 

 muscles are the same, only instead of bulbo-cavernosus the con- 

 strictor vagina. 



The urethra (one to an inch and a half long, before, four to 

 six lines, behind, three lines broad), passes backwards beneath the 

 pubic arch on the anterior surface of the vagina curved rather up- 

 wards. Its orifice lies a quarter of an inch below the clitoris. 



The vagina (four inches long, one inch broad) curved, ascends, 

 backwards, between urethra, bladder, and rectum ; between their 

 openings and that of the last a triangular space exists (the base of 

 which lies below, since the vagina and rectum lie close upon one 

 another, fifteen lines above the orific. ani.), in which adipose as 

 well as areolar tissue, fibres of mm. transvers., sphincter, levator 

 ani, constrictor vagina, and the vasa transvers. perinaiare found. 

 To their sides fascia pelvis is firmly attached. 



The triangular space of the vestibule between the clitoris and the 

 orificium urethra is taken advantage of in Lithotomy ; in it we 

 find : 1. The mucous membrane. 2. Very vascular areolar tissue 

 in the centre, the roots of the clitoris covered by the mm. ischio- 

 cavern. and the anterior extremity of sphincter vagina on the 

 sides. 3. Fascia perinai (with the art. transvers. perinai) per- 

 forated by the urethra. 4. Vv, dor sales clitorid., collum vesica 

 and ligg. jmbo-vesicalia. 5. The inferior portion of the anterior 

 wall of the bladder. 



